7. Google's blogs talk only about Google services and products. This blog also talks about competitor's products.

8. Google's blogs don't accept comments. This blog does.

9. Google's blogs don't have posts about yet to be released features or personal opinions about Google products. They don't start a post with: "The latest version of Google Toolbar for IE has a strange new feature: keep Google as the default search engine."

10. Usually Google's official blogs don't talk about a Google Operating System. Basically because it doesn't exist.

Update: If this post seems confusing, a post and some discussion from Google Blogoscoped might be helpful. Also read this disclaimer.